bwaites Wrote:Naw, useless. Couldn't get the velocities you want from a 120 bullet. The 6.8 barely manages with short bullets. No way with anything with a decent BC.I didn't say to use the 120gr Norma, just that a bullet with its ogive shape would (barely) fit in a 42mm case. The bullet would have to be lighter than 120gr, and BC would certainly be less than the more streamlined bullets suited to 6.5 Grendel, but to replace 5.56 only it might be worth testing.
Quote:A 6MM 105 or similar might work, but 6mm is barely better than 5.56, and I can't imagine the .mils considering such a minimal change.Probably they wouldn't. Then again, 6mm was one of the bullets in the recent ARDEC tests.
Quote:Actually, scratch that, it wouldn't work. You would lose too much powder room even with the 6mm light bullets, at least the ones with decent BC's.I don't see why it wouldn't work. The 90gr E-Tip and 95gr SMK have decent BCs, and look like they'd cut powder capacity less than a 123gr Scenar in the 6.5 Grendel case.
Regardless, I still like the idea. It'd be sort of a magnum version of the 1970s 6mm SAW round. Imagine if the M14 and M60 had been chambered for 6x42 (or better yet, 6x43, without the 2.25" length restriction), there would never have been a need for the M16 and M249!
http://www.youtube.com/watch?v=N06ySsT2EKU
http://www.youtube.com/watch?v=48pFvx4hlbo